<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/html">
<head>
    <meta charset="UTF-8">
    <title>这是一个标题</title>
    <style>
        span{
            border: red double 2px;
            margin-left: 20px;
            margin-right: 20px;
        }
        h1{
            border: red solid 2px;
            height: 100px;
            width: 200px;
        }
    </style>
</head>
<body>
<h1>⽤⼾注册</h1>
<table>
    <tr>
        <td>⽤⼾名</td>
        <td><input type="text" placeholder="请输⼊⽤⼾名"></td>
    </tr>
    <tr>
        <td>⼿机号</td>
        <td><input type="text" placeholder="请输⼊⼿机号"></td>
    </tr>
    <tr>
        <td>密码</td>
        <td><input type="text" placeholder="请输⼊密码"></td>
    </tr>
</table>
<div>
    <input type="button" value="注册">
    <span>已有账号? </span><a href="http://www.baidu.com">登录</a><br/>
</div>
</body>
</html>